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  KHF950


  



Condition Price Delivery Action
OH OUTRIGHT $24,150.00 Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT $24,500.00 Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT $25,250.00 Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT $25,500.00 Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT $25,450.00 Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT $26,500.00 Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT Call or RFQ Call or RFQ
Valid as of 09/02/14 03:56:35 EST
Condition Price Delivery Action
OH OUTRIGHT Call or RFQ Call or RFQ
Valid as of 09/02/14 03:56:35 EST
FEATURES / SPECS / PARTS

KHF950

HF system without SELCAL option consisting of KTR-953 (-00) R/T KAC-952 (-00) Antenna Coupler KCU-951 Control and installation kits.

Bendix King logo
KHF-950
** Photo represents standard system **
FEATURES
  • High Frequency Communications System typically consisting of KAC-952 antenna coupler, KTR-953 receiver/exciter and digital DZUS mount KCU-951 CDU
  • KCU-951 control may be substituted for compact, smaller KFS-594 control when used with KA-594 Adapter
  • Gas discharge readouts display all frequencies and preset channel numbers
  • Has 99 pilot programmable channels
  • Provides direct access to frequencies from 2 to 30 MHz (280,000 frequencies)
  • Models available with Selective Calling (SELCAL) capability (see table below)
  • 150 watts SSB, 35 watts AM
  • Antenna coupler (KAC-952) models available with explosion proof casing and external tuning capability (see table below)
  • KCU-951 model available with black or gray face plates
  • Photocell adjusts brightness of display
  • Automatic Link Establishment (ALE) capability when used configured with KCU-1051, KTR-953 (-61), and KAC-952 (-11/12)
  • Adapters available for various HF installations and antenna usage - see KA-158, KA-160, KA-161, KA-162
  • Commonly used with KIT-950 Long Wire HF Antenna Kit
  • May be configured in single or dual system configuration (see "PRODUCT FAQ" tab for configuration diagrams)


**Note: For more details on the components in this system, please reference the above individual products**
Additional Information:Click Here for Pilot's Guide
Part NumberHF Comm System:
KHF-950 System 1A SEA System P/N includes KTR-953 -00, KCU-951, KAC-952 -00kits 
KHF-950 System 1B SEA System P/N includes KTR-953 -00, KAC-952 -00, KFS-594, KA-954 & kits
KHF-950 System 2A SEA System P/N includes KTR-953 -01, KCU-951, KAC-952 -00 & kits
KHF-950 System 2B SEA System P/N includes KTR-953 -01, KAC-952 -00, KFS-594, KA-594 & kits
KHF-950 System 3A SEA System P/N includes KTR-953 -01, KCU-951, KAC-952 -01 & kits
KHF-950 System 3B SEA System P/N includes KTR-953 -01, KAC-952 -01, KFS-594, KA-594 & kits
KHF-950 System 4A SEA System P/N includes KTR-953 -01, KCU-951, KAC-952 -02 & kits
KHF-950 System 4B SEA System P/N includes KTR-953 -01, KAC-952 -02, KFS-594, KA-594 & kits

 

  
AVAILABLE KHF950
Availability details valid as of 09/02/14 03:56:35 EST


Part #: KHF-950 System 1A HF Communications System
Condition Price Delivery Action
OH OUTRIGHT $24,150.00 Call or RFQ


Part #: KHF-950 System 1B HF Communications System
Condition Price Delivery Action
OH OUTRIGHT $24,500.00 Call or RFQ


Part #: KHF-950 System 2A HF Communications System
Condition Price Delivery Action
OH OUTRIGHT $25,250.00 Call or RFQ


Part #: KHF-950 System 2B HF Communications System
Condition Price Delivery Action
OH OUTRIGHT $25,500.00 Call or RFQ


Part #: KHF-950 System 3A HF Communications System
Condition Price Delivery Action
OH OUTRIGHT $25,450.00 Call or RFQ


Part #: KHF-950 System 3B HF Communications System
Condition Price Delivery Action
OH OUTRIGHT $26,500.00 Call or RFQ


Part #: KHF-950 System 4A HF Communications System
Condition Price Delivery Action
OH OUTRIGHT Call or RFQ Call or RFQ


Part #: KHF-950 System 4B HF Communications System
Condition Price Delivery Action
OH OUTRIGHT Call or RFQ Call or RFQ
PRODUCT FAQ
Click on a question below to see the answer.
If you have a question about this model that is not answered below,
please contact sales@seaerospace.com

Can the KFS-594 small HF control be used with the KHF-950 HF System?
Yes, but only when used with the KA-594 HF adapter. The KFS-594 control was originally designed for use with the KHF-990 helicopter HF system. The KHF-950 system normally uses the KCU-951 DZUS mount control. Therefore, the KA-594 adapter is not required for use with the KHF-990 system only the KHF-950.



  
What is SELCAL?
SELCAL or Selective Calling is a function that allows a ground radio operator to alert an aircraft crew that the operator wishes to communicate with that aircraft. Because of the background noise level experienced on HF (High Frequency) radio frequencies, pilots usually prefer to turn down the audio level of their HF receiver until alerted via Selcal. When the ground station operator wants to communicate with the aircraft, they enter into the Selcal encoder the four letter code of that aircraft. This four letter code is usually included in the aircraft's flight plan and it is transmitted over the assigned radio channel. All aircraft monitoring that specific channel receive the Selcal broadcast but only those that have been programmed with that four letter code will respond by sounding a chime or some other alert for the crew.



  
Do you have information on the single and dual configurations of the KHF-950 System?
Yes.
Click to view Single configuration.
Click to view Dual configuration.




  
Why are KHF-950 components with the letter P in the serial number undesirable?
P serial number KHF-950 units are normally initial production units without most recommended service bulletins or product improvements. Most P serial number units still available on the avionics aftermarket are in poor condition and can be very unreliable.



  
Why are KHF-950 components below serial number 1500 undesirable?
Serial number 1500 and below limits the component interface availability of the system and in the aircraft. That is, all of the units in the system must be below 1500 in order for a complete system to function correctly. In addition, these serial numbers indicate older units which cause reliability issues.



  
Can the KHF-950 be installed into a helicopter?
Yes, with the appropriate equipment, hardware, antenna, and installation considerations.

A shorted tranline often referred to as "towel bar" antennas are best suited for helicopter applications. Towel bar antennas are attached parallel to the tailboom and fed in on the forward end (please see below example). Very specific instructions in relation to spacing, antenna construction, length, and mounting surface should be followed in order to minimize poor efficiencies at the low frequencies.



Since the towel bar style antenna is considered a short or shunt type HF antenna, the -02 version of the KAC-952 antenna coupler along with the KA-161 external capacitor must be utilized in this type of installation.

In certain installations, a towel bar style antenna may not be possible. Therefore, the KA-98 probe antenna may be used in the KHF-950 system. The same installation considerations (as mentioned above) would need to be observed since all short antennas provide poor efficiencies at low frequencies. A rod style antenna element is installed onto the front of the KA-98 (see picture below). It is important that the probe antenna be provided with a good RF ground. Therefore, the coax feedline from the KAC-952 coupler to the KA-98 cannot exceed 18 inches. In addition, the KA-98 can only be used with the -02 version of the KAC-952 and the KA-161 external capacitor to allow the antenna to tune more efficiently.

If this 18 inch requirement cannot be met, then the KHF-990 HF system should be considered since the amplifier is built in to the KAC-992 probe antenna coupler.





  
What HF antenna would be suitable for a Cessna Citation?
For most Cessna Citation models, the following Dayton Granger parts will serve as a suitable HF antenna:

5ARM300-11C Tension Unit
14379 Anti-Precip Wire (30 feet)
16390 Feedthru Assembly
3280 Anchor Kit

Please search individual parts on SEA's website for pricing.



  
The KHF-950 I recently installed will not tune, what could be the problem?
Many of the tuning problems with the KHF-950 are related to improper antenna installation. Here are a few possibilities:
  • Poor connection on antenna feed thru.

  • Long wire broken (a wire can crack and not be visible because of the thick insulation)

  • For a short antenna run where the termination point is grounded, the ground may have become disconnected

  • The wire from the KAC-952 coupler to the antenna should only be 6 inches ideally. A length of 18 inches is the absolute maximum. If the antenna feedline is longer than this, the efficiency of the KAC-952 will be greatly reduced possibly causing tuning failures at certain frequencies.

In some cases, the KTR-953 could be at fault but not likely in most cases. If the tune cycle starts, then the KTR is providing ample power to the KAC. If the tune cycle never starts and the system immediately goes into tune faulty (beeping tone in headset) when the PTT is activated, then the KTR most likely is faulty.



  
For the KHF-950 system, can the KTR-953 and KAC-952 be mounted in different locations in an aircraft?
Yes, the KTR-953 receiver/exciter and KAC-952 antenna coupler can be mounted in different locations but problems may be encountered as a result. When the KTR-953 and KAC-952 are mounted in different locations, transmitter distortion and common mode rejection can be encountered within the system. Other symptoms might include:
  • Display flashing intermittently when the user tries to tune the HF
  • Audio distorted when transmitting on AM or SSB
  • Output power low and varies when measured with wattmeter
If the KTR-953 and KAC-952 must be mounted more than 3 feet apart, then there are 3 Service Bulletins that should be incorporated into these units.
  • KTR-953 Service Bulletin 8 is effective for units S/N 29974 and below. This SB consists of removing several parts, install some wires, and mounting an feedback board into the unit
  • KAC-952 Service Bulletin 9 is effective for units S/N 14332 and below or units with an older control board. This SB consists of make changes to the ALC circuit.
  • KAC-952 Service Bulletin 10 is effective for units S/N 14884 and below or units with an older control board. This SB is a continuation of the modifications performed on KAC-952 SB 9 and consists of replacing several resistors and capacitors in the unit.
All 3 service bulletins are recommended for this installation condition. All 3 service bulletins are interdependent of each other and must all be installed for the system to function properly under these circumstances.

For more information on these modifications, please contact an SEA service representative today.



  
What type of HF antenna do I need?
The issue of HF antenna installation on an aircraft can be generalized with 2 considerations:
  • Type of aircraft
  • Location of antenna coupler
Since there are numerous types of aircraft with varying installation requirements, there are several HF antenna configurations. Whatever the case may be, the antenna is a major factor for maximum performance of the HF system.

More or less, HF antenna configurations fall into four categories:

“V” and long wire configuration

The “V” and long wire antenna configuration is the optimal HF antenna configuration. It provides consistent performance and efficiency. This configuration should not be used on very high speed fixed wing aircraftand helicopters.

The wing “V” configuration is an effective HF antenna configuration for slow and moderate speed aircraft. This configuration provides an omnidirectional radiation Pattern. It has has the disadvantages of high drag and on low wing aircraft is prone to being walked into.

Wing Tip V Antenna

The inverted “V” antenna is recommended when a wing "V" is not practical and the antenna coupler is mounted in the back of the aircraft. The inverted “V” antenna will produce maximum signal strength off the side of the aircraft and provide good efficiency at most frequencies. The inverted “V” produces a moderate amount of drag.

Inverted V Antenna

The long wire antenna is used when the HF coupler is located in the forward part of the aircraft. The long wire provides maximum signal radiation off the sides of the aircraft and exhibit good efficiency even at the lower frequencies. Nulls in signal strength may be experienced off the nose and tail of the aircraft.

Long Wire Antenna


Short grounded wire configuration

Short grounded wire antennas are primarily used on higher speed and/or high altitude aircraft. The short wire antenna have minimum drag and do not develop as high of RF voltages as the longer wire antennas. However the efficiency of the short antenna will be lower, especially at the low frequencies.

Short Wire Antenna


Shunt configuration

There a generally 2 types of shunt antennas. A towel bar style includes a rod or tube mounted on the airframe usually suited for helicopters.

Shunt Antenna - Towel Bar Style

The other type of shunt antenna is designed by the aircraft manufacturer as a part of the airframe structure on the leading edge of the vertical stabilizer. Leading edge antennas are ideal for Larger, high altitude jet aircraft.

Shunt Antenna - Aircraft


Probe configuration

Probe HF antennas are ideal on aircraft where a long antenna is not suitable. It should be noted that probe antennas provide poor efficiency at lower frequencies as is the case with most short style antennas.

Probe Antenna





  
Does Southeast Aerospace provide flight manual supplement and/or FAA Form 337 for systems that we have not installed?
Southeast Aerospace does not offer Return To Service paperwork services on General Aviation aircraft for installations that we do not perform.



  
What rack do I use to mount the KAC-952 horizontally?
The KAC-952 has mounting flanges on 2 sides of the unit. The flanges on the bottom of the unit are to mount the unit vertically (i.e. straight up) or horizontally (on its side). These flanges are used to fit and secure the unit into the mounting rack P/N 071-04030-0000. Therefore, the same rack can be used to mount the unit either vertically or horizontally.



  
Is an STC required for an HF system installation?
In most cases, a Supplemental Type Certificate is not required for the installation of an HF system. Major changes or alterations to an aircraft may include those which affect weight, balance, structural aspects, reliability, operational characteristics, airworthiness characteristics, etc. Some major alterations can be performed using the FAA Form 337 with approved data. This approved data can be in the form of engineering data with a FAA designee approval (i.e. DER, DAR). The DER or DAR then issues an FAA Form 8110 which is considered approved data adequate to proceed with the installation.

HF installations in the USA are installed and approved in the method detailed above. STCs are not required for almost all HF installations since the change to the existing aircraft Type Certificate (TC) is not so intensive as to require one.



  
KHF950 Product FAQ

Click on a question below to see the answer.
If you have a question about this model that is not answered below, please contact sales@seaerospace.com

Can the KFS-594 small HF control be used with the KHF-950 HF System?
Yes, but only when used with the KA-594 HF adapter. The KFS-594 control was originally designed for use with the KHF-990 helicopter HF system. The KHF-950 system normally uses the KCU-951 DZUS mount control. Therefore, the KA-594 adapter is not required for use with the KHF-990 system only the KHF-950.



  
What is SELCAL?
SELCAL or Selective Calling is a function that allows a ground radio operator to alert an aircraft crew that the operator wishes to communicate with that aircraft. Because of the background noise level experienced on HF (High Frequency) radio frequencies, pilots usually prefer to turn down the audio level of their HF receiver until alerted via Selcal. When the ground station operator wants to communicate with the aircraft, they enter into the Selcal encoder the four letter code of that aircraft. This four letter code is usually included in the aircraft's flight plan and it is transmitted over the assigned radio channel. All aircraft monitoring that specific channel receive the Selcal broadcast but only those that have been programmed with that four letter code will respond by sounding a chime or some other alert for the crew.



  
Do you have information on the single and dual configurations of the KHF-950 System?
Yes.
Click to view Single configuration.
Click to view Dual configuration.




  
Why are KHF-950 components with the letter P in the serial number undesirable?
P serial number KHF-950 units are normally initial production units without most recommended service bulletins or product improvements. Most P serial number units still available on the avionics aftermarket are in poor condition and can be very unreliable.



  
Why are KHF-950 components below serial number 1500 undesirable?
Serial number 1500 and below limits the component interface availability of the system and in the aircraft. That is, all of the units in the system must be below 1500 in order for a complete system to function correctly. In addition, these serial numbers indicate older units which cause reliability issues.



  
Can the KHF-950 be installed into a helicopter?
Yes, with the appropriate equipment, hardware, antenna, and installation considerations.

A shorted tranline often referred to as "towel bar" antennas are best suited for helicopter applications. Towel bar antennas are attached parallel to the tailboom and fed in on the forward end (please see below example). Very specific instructions in relation to spacing, antenna construction, length, and mounting surface should be followed in order to minimize poor efficiencies at the low frequencies.



Since the towel bar style antenna is considered a short or shunt type HF antenna, the -02 version of the KAC-952 antenna coupler along with the KA-161 external capacitor must be utilized in this type of installation.

In certain installations, a towel bar style antenna may not be possible. Therefore, the KA-98 probe antenna may be used in the KHF-950 system. The same installation considerations (as mentioned above) would need to be observed since all short antennas provide poor efficiencies at low frequencies. A rod style antenna element is installed onto the front of the KA-98 (see picture below). It is important that the probe antenna be provided with a good RF ground. Therefore, the coax feedline from the KAC-952 coupler to the KA-98 cannot exceed 18 inches. In addition, the KA-98 can only be used with the -02 version of the KAC-952 and the KA-161 external capacitor to allow the antenna to tune more efficiently.

If this 18 inch requirement cannot be met, then the KHF-990 HF system should be considered since the amplifier is built in to the KAC-992 probe antenna coupler.





  
What HF antenna would be suitable for a Cessna Citation?
For most Cessna Citation models, the following Dayton Granger parts will serve as a suitable HF antenna:

5ARM300-11C Tension Unit
14379 Anti-Precip Wire (30 feet)
16390 Feedthru Assembly
3280 Anchor Kit

Please search individual parts on SEA's website for pricing.



  
The KHF-950 I recently installed will not tune, what could be the problem?
Many of the tuning problems with the KHF-950 are related to improper antenna installation. Here are a few possibilities:
  • Poor connection on antenna feed thru.

  • Long wire broken (a wire can crack and not be visible because of the thick insulation)

  • For a short antenna run where the termination point is grounded, the ground may have become disconnected

  • The wire from the KAC-952 coupler to the antenna should only be 6 inches ideally. A length of 18 inches is the absolute maximum. If the antenna feedline is longer than this, the efficiency of the KAC-952 will be greatly reduced possibly causing tuning failures at certain frequencies.

In some cases, the KTR-953 could be at fault but not likely in most cases. If the tune cycle starts, then the KTR is providing ample power to the KAC. If the tune cycle never starts and the system immediately goes into tune faulty (beeping tone in headset) when the PTT is activated, then the KTR most likely is faulty.



  
For the KHF-950 system, can the KTR-953 and KAC-952 be mounted in different locations in an aircraft?
Yes, the KTR-953 receiver/exciter and KAC-952 antenna coupler can be mounted in different locations but problems may be encountered as a result. When the KTR-953 and KAC-952 are mounted in different locations, transmitter distortion and common mode rejection can be encountered within the system. Other symptoms might include:
  • Display flashing intermittently when the user tries to tune the HF
  • Audio distorted when transmitting on AM or SSB
  • Output power low and varies when measured with wattmeter
If the KTR-953 and KAC-952 must be mounted more than 3 feet apart, then there are 3 Service Bulletins that should be incorporated into these units.
  • KTR-953 Service Bulletin 8 is effective for units S/N 29974 and below. This SB consists of removing several parts, install some wires, and mounting an feedback board into the unit
  • KAC-952 Service Bulletin 9 is effective for units S/N 14332 and below or units with an older control board. This SB consists of make changes to the ALC circuit.
  • KAC-952 Service Bulletin 10 is effective for units S/N 14884 and below or units with an older control board. This SB is a continuation of the modifications performed on KAC-952 SB 9 and consists of replacing several resistors and capacitors in the unit.
All 3 service bulletins are recommended for this installation condition. All 3 service bulletins are interdependent of each other and must all be installed for the system to function properly under these circumstances.

For more information on these modifications, please contact an SEA service representative today.



  
What type of HF antenna do I need?
The issue of HF antenna installation on an aircraft can be generalized with 2 considerations:
  • Type of aircraft
  • Location of antenna coupler
Since there are numerous types of aircraft with varying installation requirements, there are several HF antenna configurations. Whatever the case may be, the antenna is a major factor for maximum performance of the HF system.

More or less, HF antenna configurations fall into four categories:

“V” and long wire configuration

The “V” and long wire antenna configuration is the optimal HF antenna configuration. It provides consistent performance and efficiency. This configuration should not be used on very high speed fixed wing aircraftand helicopters.

The wing “V” configuration is an effective HF antenna configuration for slow and moderate speed aircraft. This configuration provides an omnidirectional radiation Pattern. It has has the disadvantages of high drag and on low wing aircraft is prone to being walked into.

Wing Tip V Antenna

The inverted “V” antenna is recommended when a wing "V" is not practical and the antenna coupler is mounted in the back of the aircraft. The inverted “V” antenna will produce maximum signal strength off the side of the aircraft and provide good efficiency at most frequencies. The inverted “V” produces a moderate amount of drag.

Inverted V Antenna

The long wire antenna is used when the HF coupler is located in the forward part of the aircraft. The long wire provides maximum signal radiation off the sides of the aircraft and exhibit good efficiency even at the lower frequencies. Nulls in signal strength may be experienced off the nose and tail of the aircraft.

Long Wire Antenna


Short grounded wire configuration

Short grounded wire antennas are primarily used on higher speed and/or high altitude aircraft. The short wire antenna have minimum drag and do not develop as high of RF voltages as the longer wire antennas. However the efficiency of the short antenna will be lower, especially at the low frequencies.

Short Wire Antenna


Shunt configuration

There a generally 2 types of shunt antennas. A towel bar style includes a rod or tube mounted on the airframe usually suited for helicopters.

Shunt Antenna - Towel Bar Style

The other type of shunt antenna is designed by the aircraft manufacturer as a part of the airframe structure on the leading edge of the vertical stabilizer. Leading edge antennas are ideal for Larger, high altitude jet aircraft.

Shunt Antenna - Aircraft


Probe configuration

Probe HF antennas are ideal on aircraft where a long antenna is not suitable. It should be noted that probe antennas provide poor efficiency at lower frequencies as is the case with most short style antennas.

Probe Antenna





  
Does Southeast Aerospace provide flight manual supplement and/or FAA Form 337 for systems that we have not installed?
Southeast Aerospace does not offer Return To Service paperwork services on General Aviation aircraft for installations that we do not perform.



  
What rack do I use to mount the KAC-952 horizontally?
The KAC-952 has mounting flanges on 2 sides of the unit. The flanges on the bottom of the unit are to mount the unit vertically (i.e. straight up) or horizontally (on its side). These flanges are used to fit and secure the unit into the mounting rack P/N 071-04030-0000. Therefore, the same rack can be used to mount the unit either vertically or horizontally.



  
Is an STC required for an HF system installation?
In most cases, a Supplemental Type Certificate is not required for the installation of an HF system. Major changes or alterations to an aircraft may include those which affect weight, balance, structural aspects, reliability, operational characteristics, airworthiness characteristics, etc. Some major alterations can be performed using the FAA Form 337 with approved data. This approved data can be in the form of engineering data with a FAA designee approval (i.e. DER, DAR). The DER or DAR then issues an FAA Form 8110 which is considered approved data adequate to proceed with the installation.

HF installations in the USA are installed and approved in the method detailed above. STCs are not required for almost all HF installations since the change to the existing aircraft Type Certificate (TC) is not so intensive as to require one.



  



Item is not available for over-the-counter(OTC) sale and must be installed by Southeast Aerospace.

If you are interested in an installation quotation, please click here.